Protector rod for looms



Dec. 16, 1941. J, M, A- mc' 2,266,473

PROTECTOR ROD FOR LOOMS Filed Jur l e 3, 19 41 NVENTOR U'osEPH M. PATRuc K ATTORNEY Patented Dec. 16, 1941 UNITED STAT PROTECTOR ROD Fo'RLo-oivrs Joseph M. Patrick, Worcester, ll/lass, assignor to Crompton &

Knowles Loom.Works, Worcester,

Mass, a corporation of Massachusetts Application June 3, 1941, Serial No. 396,423 8 Claims. (01. 139 345) This invention relates to protector mechanism for looms and it is the general object of the invention to provide a cheap and durable rod and dagger assembly.

Protector mechanisms for looms customarily employ a rod rockably mounted on the front part of the lay and provided with forwardly extending daggers normally in stopping position but moved to non-stopping position'if theshuttle arrivesin the shuttle box in time to prevent a smash of the warp threads. Heretofore it has been customary to make the daggers integral with the rod either by forging or welding. Experience shows that failure of the protector rod is likely to result from its breakage a short distance from the dagger, indicating that the difference in heat treatment in different parts of the rod, incident either to welding or forging, has produced a weak zone which fractures when the rod is subjected to'the strain of protection. It is'an important object of my present invention to provide a rod and dagger assembly which can be built without subjecting the rod to heat treatment.

It is also found that welding or forging processes are relatively expensive, particularly in fin ishing operations subsequent to the steps which involve heat. It is a further object of my present invention to provide a protector rod which can be produced more cheaply than those now in use. j

A more particular object of my present invention is to provide one end of the-daggers with a concave surface which fits the adjacent periphery of the rod to reinforce that part of the rod through which extends the shank of a securing stud which connects the rod to the dagger.

It is a further object of my present invention to attach the dagger to the rod by means of a stud one end of which is preferably brazed or otherwise secured to the dagger while the other end extends through and is riveted or otherwise attached to the rod by means which avoid the application of heat to the rod. The stud extends longitudinally of the dagger and is not subjected to the lateral strains when the protectingforce is transmitted from the rod along the dagger to the hunter on the breast beam.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawing, wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a vertical longitudinal section through a loom showing a protector-rod made according to my present invention'attached to the'l-ay,

Fig. 2' is an enlarged horizontal section on line 2-2 of Fig. l,

Fig. 3 is an essernbly view showing the three component parts, namely the drilled rod, the stud, and the dagger prior to assembly, and

Fig. 4 is a vertical section on line 4-4, Fig. 2 on an enlarged scale and showing the parts of Fig. 3 after they are assembled.

Referring to Fig. 1, the loom frame HI has a breast beam 'II on the under side of which is mounted a bunter or knock-off lever 12 having a notch l3 and connected in usualmanner to loom stopping mechanism not shown. The lay L is mounted onswords I5 pivoted to the loom frame at l6 and reciprocated in usual manner by mechanism not shown. "The top of the lay is provided with a shuttle box Bto receive a shuttle S, and a binder I1 is moved outwardly by the shuttle when it enters the box to move forwardly a protector finger [8. The protector rod 20' rockable in bearings 2! on the lay has the finger l8 adjustably secured thereto-at l9 and dagger 22 on rod '20 is mounted normally to enter notch l3 as the lay advances.

The parts thus far described are of common construction and operate in the usual manner, the finger l8 being moved forwardly at a given point in the advanceof the lay to depress the dagger below the knock-off lever if the shuttle is properly boxed. If, on the other hand, the shuttle is slow in reaching theshuttle box, the finger I8 will not be moved forwardly in time to prevent a protector operation and the lay will be stopped by entry of the dagger into notch I3. Springlfl connected to bearing 2| and acollar 4| on red 20 acts in the usual manner to hold the dagger normally raised in alignment with notch l3. Except as noted hereinafter the foregoing is of usual construction and operates in the ordinary manner.

In carrying my present invention into effect I provide a protector rod assembly shown in Figs. 3 and 4. The protector rod 20 extends along the lay and will have each end thereof provided with one of the fingers l8 and also a dagger 22, and since both ends of the protector rodand the parts attached thereto are substantially the same, this description will be confined to one end of the rod.

As shown in Fig. 3 the dagger has a body 25 which tapers toward the forward point 26. The large end 21 is provided with a concave surface 28 which is preferably concentric with the axis of the rod after assembly, and a bore 29 is drilled from this concentric surface into the body of the dagger toward the pointed end in the direction of the length of the dagger.

A connecting stud shown in Fig. 3 has an enlarged head 3| and a reduced shank 32, and the rod 20 is provided with a diametral bore to receive the shank 32. The rear end of bore 35 may be counter-sunk, as at 36.

In assembling the parts, the head 3| is inserted into the bore 29 and brazed or otherwise secured to the dagger, after which the shank 32 is inserted into the bore 35 and its'rear end peened over, as at 31. When thus assembled the parts will appear as shown in Fig. 4 with the surface 28 drawn into close contact with the adjacent cylindrical surface of the rod.

The rod is then mounted in the bearings 2i and the finger 18 adjusted at I9 to cause the forward pointed end of the dagger to traverse a path below the notch l3 when the shuttle is properly boxed. The spring and collar M to which one of its ends is attached are placed on the rod after the dagger is secured thereto, but should the collar and spring be located on the other side of the dagger from that shown in Fig. 2, these parts will be placed on the rod before the dagger is attached to it.

At the time of protection a stopping force will be transmitted longitudinally along the dagger and transmitted through the concave surface 23 to the rod 20 and thence to the bearing 2|. Since the stud 3t) has its axis substantially in the line along which the stopping force is transmitted, little or no tendency exists to dislodge the stud with respect either to the dagger or the rod, or to shear it during a protection operation. It will also be seen that when the dagger is subjected to a rearward force the upper and lower parts of the concave surface 28 which extend on both sides of the stud reinforce that part of the rod 20 perforated by the bore 35 and thus serves to prevent loosening of the shank 32 in the rod.

From the foregoing it will be seen that I have provided a simple protector rod assembly which does not subject the rod to heating and in which the connecting stud 30 has the axis thereof disposed substantially along the line of force to which the dagger is subjected at the time of protection. It will further be seen that parts of the concave surface 28 exert a reinforcing action on the perforated part of the rod 23 tending to hold the shank 32 tightly in the bore 35 whenever the loom protects. When the rear end of the shank 32 is peened over as at 3'! the rod is complete and no further finishing operations are required such as have been necessary in protector rods as heretofore constructed. The assembly is cheap to make and heating of the dagger incident to the brazing operation does not appear to weaken the dagger.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not Wish to be limited to the details herein disclosed, but what I claim is:

1. In protector mechanism for a loom having a lay and a knock-off bunter, a rod rockably mounted on the lay, a dagger for the hunter, a member to connect the rod and dagger having a head extended into and secured to the dagger and having a part extending through and peened to the rod.

2. In protector mechanism for a loom having a lay and a knock-off hunter, 2. rod rockably mounted on the lay, a dagger for the hunter, a member to connect the rod and dagger having an elongated body extending in the direction of the length of the dagger and having one end extending into and secured to the dagger and having the other end extending into and secured to the rod.

3. In protector mechanism for a loom having a lay and a knock-01f bunter, a rod rockably mounted on the lay, a dagger for the hunter, a member to connect the rod and dagger having an elongated body extending in the direction of the length of the dagger and having an enlarged head at one end extended into and held fixed with respect to the dagger and having a shank smaller than the head extended into and secured to the rod.

4. In protector mechanism for a loom having a lay and a knock-off bunter, a rod rockably mounted on the lay, a dagger for the hunter, the end of the dagger adjacent to the rod having a'concave surface located wholly on one side of the rod and engaging the adjacent cylindrical surface of the rod, and an attaching member held in the dagger and having a part extending across the contacting curved surfaces of the dagger and rod and into and secured to the rod to hold the concave surface of the dagger against said rod.

5. In protector mechanism for a loom having a lay and a knock-off bunter, a rod rockably mounted on the lay, a dagger for the hunter, the end of the dagger adjacent to the rod being concave and engaging the adjacent cylindrical surface of the rod, and an attaching member extended into and secured to the dagger and having an end extending beyond the concave surface and through the rod and secured thereto.

6. A loom protector rod assembly comprising an elongated rod and a dagger extending transversely therefrom, and an elongated body extending in the direction of the length of the dagger and having one end extending into and secured to the dagger and having the other end extending into and secured to the rod.

7. A loom protector rod assembly comprising an elongated rod and a dagger extending transversely therefrom, and the end of the dagger adjacent to the rod having a concave surface located on one side of the rod and engaging the adjacent cylindrical surface of the rod, and an attaching member held in the dagger and having a part extending across the contacting curved surfaces of the dagger and rod and into and secured to the rod to hold the concave surface of the dagger against said rod.

8. A loom protector rod assembly comprising an elongated rod and a dagger extending transversely therefrom and having a concave surface adjacent to the rod, and an attaching member extended into and secured to the dagger and having an end extending beyond the concave surface and through the rod and secured thereto.

JOSEPH M. PATRICK. 

